Just started translating the plugin at translate.wordpress.com
Also added translation in /wp-content/plugins/newsletter/subscription/languages/ro_RO.php.
The wp-config.php has the “define (‘WPLANG’, ‘ro_RO’);” line.
After update, ro_RO.php was deleted. Uploaded ro_RO.php, but the translation is not working (the messagge
“You have successfully subscribed to the newsletter. You’ll receive” is still in the english language.